Method and Apparatus for Extermination of Pests

ABSTRACT

An extermination device for exterminating pests includes a holder, trigger mechanism and a resilient ring mounted on the holder. When a pest actuates the trigger mechanism, the ring is released from the holder onto the pest, thereby killing the pest in a humane manner. A cover may be provided to protect the trigger mechanism from dirt and animals larger than target pest size. A loading device having a tapering body adapted to allow a resilient ring to be expanded from the narrow end to the wide end of the tapering body, wherein the wide end includes a formation adapted to engage with a holder of an extermination device.

FIELD OF THE INVENTION

The invention relates to a method and apparatus for the extermination ofpests, in particular rats, stoats and other vermin.

BACKGROUND OF THE INVENTION

In a number of countries such as New Zealand, introduced species ofanimal have had a detrimental effect on the indigenous or native plant,bird, insect and other life.

In an attempt to control and exterminate pests, whether introducedspecies or not, a large number of different traps and similar mechanismshave been designed to capture and/or kill pests. A difficulty with manysuch traps is that the trapped pest does not die humanely and this canbe a particular concern. A typical trap which is inhumane is the type oftrap generally known as a gin trap which has a set of jaws to clamp apart of the pest. Normally in gin traps a pest is held until it eitherdies naturally or alternatively is killed by a person attending thetrap.

An object of the present invention is to provide a lightweight versatileuser friendly relatively inexpensive means for exterminating pests whichat least offers a useful alternative choice.

A further object of the invention is to provide a means forexterminating a pest which substantially eliminates the risk of killingwildlife which is intended to be saved or preserved by use of the meansfor extermination, or to at least provide the public with a usefulchoice.

SUMMARY OF THE INVENTION

In a first aspect, the invention provides an extermination device,comprising a holder and a trigger mechanism, the holder being configuredto hold an expanded resilient ring and the extermination device beingconfigured to release the resilient ring, such that it contracts arounda pest, when the trigger mechanism is actuated by the pest.

In a second aspect, the invention provides a method of exterminating apest, comprising the steps of: expanding a resilient ring; and releasingthe resilient ring onto a pest when the resilient ring is located aroundthe pest.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of the invention will now be described with reference to theaccompanying drawings in which:

FIG. 1 is a perspective view from the side of an extermination deviceaccording to the invention;

FIG. 2 is a side view of the extermination device shown in FIG. 1;

FIG. 3 is an end view of the extermination device;

FIG. 4 is a perspective view from the side of the extermination device;

FIG. 5 is a plan view of the exterminator device;

FIG. 6 is a vertical section through an example of an exterminationdevice incorporating a reloading and/or resetting mechanism with aplurality of resilient rings;

FIG. 7 is a perspective view of an example of an extermination devicehaving an internal trigger mechanism;

FIG. 8 is a plan view of the device of FIG. 7;

FIG. 9 is a front plan view of a further embodiment of an exterminationdevice;

FIG. 10 is a perspective view of the device of FIG. 9;

FIG. 11 is a rear plan view of the device of FIG. 9;

FIG. 12 is a side plan view of the device of FIG. 9, showing internalfeatures;

FIG. 13 shows the firing mechanism of the device of FIG. 9;

FIG. 14 shows the trigger mechanism of the device of FIG. 9;

FIG. 15 is a view similar to FIG. 9, showing the device after it hasbeen triggered and has released the resilient ring;

FIG. 16 is a view similar to FIG. 12, showing the device after it hasbeen triggered and has released the resilient ring;

FIG. 17 is a perspective view of a cover for use with the exterminationdevice of FIG. 9;

FIG. 18 is a perspective view of the device of FIG. 9 and the cover ofFIG. 17 in an assembled state; and

FIG. 19 is a plan view of a loading device for use with theextermination device of FIG. 9.

DESCRIPTION OF THE INVENTION

Examples of the invention will now be described with reference to theaccompanying drawings. The first example in FIGS. 1 to 5 of the drawingsshow the actual size of an extermination device designed for rats orstoats. It is to be appreciated that for other animals the overall sizeand dimensions of the extermination device may be larger or smaller asneeded to suit the size of the target pests.

In FIG. 1 is shown an extermination device including a holder 100 and afront cover 3.

The holder 100 is shown in more detail in FIGS. 2 to 4. The holder 100comprises a central section 1 and a cover 2, and is tubular, with aninternal bore 4. The holder may be circular in cross-section as shown inthe drawings, or may have another suitable cross-section. The diameterof the bore 4 is chosen to suit the target pest and the tube has anentrance or open mouth 5 at a first end where the pest enters. For smallpests such as mice, rats and stoats the diameter is preferably in therange 25 to 40 mm. For larger pests such as polecats, possums and cats,the diameter is preferably in the range 60 to 100 mm.

The second end of the holder 100 is formed by the cover 2, creating aclosed region in which food or an attractant is placed.

The extermination device has a trigger operated by a trigger mechanism 6shown in FIG. 3. To set the trigger mechanism, it is pushed backwards ina slot 25 and to the right (as shown in FIG. 4), such that it sits in anotch 24 in the holder. When a pest enters the trap, the triggermechanism 6 moves accurately (as shown by arrow 7 in FIG. 3), so that itis released from the notch and is forced forwards by a spring 20 torelease the resilient ring 8. The resilient ring 8 is mounted relativeto the mouth 5 of the extermination device in a release position,adjacent to the open mouth 5, such that after it slides off the openmouth 5 it contracts around whatever is within the open mouth 5 of theholder 1 00. Other trigger mechanisms may also be suitable.

The resilient ring 8 may be formed of natural or synthetic rubber or acomposite material. It could also be formed from metal in the form of aspring, or at least partly of rigid material with a biasing meanstending to force sides of the ring together. While the resilient ring ispreferably circular in shape, it could, for example, be formed from arectangle of resilient material with a hole cut through it. Otherconfigurations may also be suitable.

The resilient ring 8 has a normal diameter that is significantly lessthan the diameter of the holder at the release position so that onrelease from the open mouth 5 it contracts to its normal size which isless than the size of the neck of the target pest.

On activation of the trigger mechanism 6 by a pest whose head is withinthe mouth 5 the rubber or composite ring 8 traps whatever is in themouth of the extermination device. Any animal or pest that activates thetrip arm 6 therefore has immediately placed around its neck a resilientring which will cut off the blood and air supply to the animal therebykilling it humanely.

Since the ring 8 is not retained by the extermination means, the animalmay still move away from the site of the extermination means, so thatother pests will be able to actuate the trigger mechanism.

As shown in FIG. 1, a front cover 3 can be provided and is designed toprotect against accidental tripping of the trip arm. The front cover 3has an opening 9 to allow a pest to access the opening 5.

The front cover 3 connects with the holder at surface 10 and ispositioned so that the target animal can still reach and actuate thetrigger mechanism.

In the second example shown in FIG. 6 the extermination device hassimilar parts to those incorporated in the first example referenced bythe same numerals. In this case the exterminator device has an automaticloading mechanism. The loading mechanism includes a moveable shaft 11with a ratchet mechanism 12 operated by the trigger mechanism 6.Movement of the shaft 11 is under the bias of a spring 13. The shaft 11includes stops 14. A hinged cover 15 is provided to enable access to themechanism when it is being reloaded with more or additional rings 8.

In use when an animal pest tries to eat bait or attractant 16 it knocksthe trigger mechanism 6. A first ring is released from the releaseposition, contracting around the pest's neck. The spring 13 will thenpush forward and the trigger mechanism will be reset on its next notchready to be tripped again. The forward movement of the shaft 11 presentsthe next in the succession of rings 8 to the release position adjacentto the mouth 5 of the holder 100.

FIGS. 7 and 8 show a third example of an extermination device accordingto the invention. This example differs from the device described abovein that the trigger mechanism is located within the holder. Thisprotects the trigger mechanism from dirt, twigs and the like, which mayprevent it from functioning correctly. The trigger functions in a mannersimilar to that described above.

These figures also show the device with a base plate 21 for mounting theextermination device in a suitable position. The base plate 21preferably includes holes 22, 23 to facilitate such mounting.

A preferred embodiment of the invention is shown in FIGS. 9 to 19. FIG.9 is a front plan view, and FIG. 10 is a perspective view, of theextermination device 1, showing the trigger mechanism 6, firing hammer30 and resilient ring 8. With reference to FIG. 13, the firing hammer 30includes a generally cylindrical section 32 and a protrusion 33. Thecylindrical section 32 slides on rod 35, which is joined to the rearface of the device housing by a screw 36, as shown in FIG. 11. A spring34 is mounted on the rod 35, to urge the firing hammer 30 along the rod35 towards the resilient ring 8.

With reference to FIG. 14, the trigger mechanism 6 is formed integrallywith a lug 31 and is attached to the device housing by a screw 37.

In the cocked position shown in FIG. 12, the firing hammer compressesthe spring 34 and is held in position by the lug 31, as best shown inFIG. 9. When a pest enters the trap, forcing the trigger mechanism 6upwards, the trigger mechanism pivots around the screw 37, such that thelug 31 no longer restricts movement of the firing hammer 30. The firinghammer slides along the rod 35 towards the resilient ring 8. Theprotrusion 33 forces the resilient ring 8 off the holder, onto the pest.The position of the extermination device in the fired position as shownin FIGS. 15 and 16.

FIG. 17 shows a cover 42 for use with the extermination device of thisembodiment. The cover 42 includes a base section 40 and a cylindricalsection 41. The base section 40 may include holes and/or slots forsecuring the extermination device to the ground, a tree etc. The deviceshown in FIGS. 9 to 16 is assembled with the cover 42, as shown in FIG.18. FIG. 18 shows the device and cover in a partially assembled state.The device is pushed into the cover through the cylindrical section 41.In a fully assembled state the device would rest against the end 43 ofthe cover. This arrangement protects the mechanism of the device fromcontamination by dirt etc and prevents animals of a size greater thanthe diameter of the cylindrical section 41 from activating the trap.

FIG. 19 shows a loading device for use with the extermination device ofFIGS. 9 to 16. The loading device includes a generally conical section50 and a coupling section 51. In use, the device is set in the cockedposition and the coupling section 51 is inserted into the device, suchthat the shoulder 52 sits flush with the open mouth 5 of the device. Aresilient ring 8 can then be forced along the generally conical section50 and into the release position on the extermination device. Theloading device is then removed.

The device may be placed in any position that a targeted pest canaccess. The device may be placed on the ground, in a tree or attached toa board or post, for example.

While the present invention has been illustrated by the description ofthe embodiments thereof; and while the embodiments have been describedin detail, it is not the intention of the Applicant to restrict or inany way limit the scope of the appended claims to such detail.Additional advantages and modifications will readily appear to thoseskilled in the art. Therefore, the invention in its broader aspects isnot limited to the specific details, representative apparatus andmethod, and illustrative examples shown and described. Accordingly,departures may be made from such details without departure from thespirit or scope of the Applicant's general inventive concept.

1. An extermination device, comprising a holder and a trigger mechanism, the holder being configured to hold an expanded resilient ring, wherein the extermination device is configured to release the resilient ring free of the extermination device such that it contracts around a pest when the trigger mechanism is actuated by the pest, thereby exterminating the pest.
 2. An extermination device as claimed in claim 1, wherein the holder is tubular and is open at a first end and closed at a second end.
 3. (canceled)
 4. An extermination device as claimed in claim 2, wherein the trigger mechanism is located within the holder.
 5. An extermination device as claimed in claim 4, wherein a bait or attractant is placed such that the trigger mechanism is between the first end and the bait or attractant.
 6. (canceled)
 7. An extermination device as claimed in claim 1, including a firing member, wherein the holder is configured to hold the resilient ring in a release position and the firing member is biased towards the release position, and wherein the firing member and trigger mechanism are arranged such that the firing member is released from a cocked position and forces the resilient ring off the holder, when the trigger mechanism is actuated.
 8. (canceled)
 9. An extermination device as claimed in claim 1, wherein the resilient ring is made from natural or synthetic rubber.
 10. An extermination device as claimed in claim 1, wherein the resilient ring is made from a composite material.
 11. (canceled)
 12. An extermination device as claimed in claim 1, wherein a dimension of an opening of the holder is in the range 25 to 40 mm.
 13. An extermination device as claimed in claim 1, wherein a dimension of an opening of the holder is in the range 60 to 100 mm.
 14. An extermination device as claimed in claim 1, wherein the holder is configured to hold a plurality of expanded resilient rings and to hold a first one of the expanded resilient rings at a release position, and the extermination device is configured to release the first one of the of expanded resilient rings when the trigger mechanism is actuated and to move a second one of the expanded resilient rings to the release position when the first one of the expanded resilient rings is released from the release position.
 15. (canceled)
 16. An extermination device as claimed in claim 10, further comprising a biasing means configured to apply a force to the second one of the resilient rings, towards the release position.
 17. An extermination device as claimed in claim 16, wherein the biasing means is coupled to the trigger mechanism.
 18. An extermination device as claimed in claim 1, configured to release the resilient ring, such that it contracts around the neck of the pest.
 19. A method of exterminating a pest, comprising the steps of: holding an expanded resilient ring on a holder; and releasing the resilient ring free of the holder such that it contracts around a pest when a trigger mechanism is actuated by the pest, thereby exterminating the pest.
 20. (canceled)
 21. (canceled)
 22. (canceled)
 23. A method as claimed in claim 14, further comprising the step of placing a bait or attractant in the holder such that the trigger mechanism is between the first end and the bait or attractant.
 24. (canceled)
 25. A method as claimed in claim 14, wherein the step of holding the expanded resilient ring comprises holding a plurality of expanded resilient rings, and the step of releasing the resilient ring comprises releasing one of the plurality of expanded resilient rings.
 26. A method as claimed in claim 25, wherein the step of holding the expanded resilient ring comprises holding a first one of the plurality of the expanded resilient rings at a release position, the method further comprising the step of moving a second one of the expanded resilient rings to the release position when the first one of the expanded resilient rings is released.
 27. A method as claimed in claim 14, using the extermination device of claim
 1. 28. A loading device having a tapering body adapted to allow a resilient ring to be expanded from the narrow end to the wide end of the tapering body, wherein the wide end includes a formation adapted to engage with a holder of an extermination device.
 29. A loading device as claimed in claim 28 in combination with an extermination device of claim
 1. 30. (canceled) 